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Prosecutors called Thursday for a German man accused of sexually abusing his daughter, stepdaughter and stepson to spend more than 14 years in jail, in a case that has shocked the country.

The 48-year-old former trucker, identified only as Detlef S., has admitted to fathering eight children with his stepdaughter - one of whom died - but denied raping her. He has also confessed to abusing his daughter.

The victims are "seriously traumatised" by their ordeal, prosecutor Thorsten Kahl told the court in Koblenz, western Germany, in his closing remarks.

"They will suffer from the actions of the accused for their whole lives," he said, adding that they required "urgent therapeutic support."

The sentence demanded - 14 years and six months - was just under the maximum possible of 15 years. Kahl also called for S. to be placed in preventative custody.

Kahl said S. had begun to abuse his daughter when she was nine-years-old and his stepdaughter when she was 12. The evidence had "completely confirmed" the charges against the accused, added the prosecutor.

In total S. is charged with 350 counts of sexual assault and grievous sexual assault of minors over a 20-year period in the tiny village of Fluterschen, near Koblenz.

He is also accused of prostituting his stepdaughter and his biological daughter out to others at 40 deutschmarks and later €30 to €50 per time, while he allegedly watched.

Co-plaintiffs were due to testify later Thursday. The defence team was set to sum up on Monday, with a verdict expected the day after.

Several German media outlets have compared the case to that of Austrian Josef Fritzl, who held his daughter Elisabeth as a sex slave in a cramped dungeon for 24 years. He was jailed for life in 2009.